MX2010013754A - Method and apparatus to suppress vibrations in a rolling mill. - Google Patents

Abstract

The present invention relates to a method and to an apparatus for suppression of vibrations in a rolling mill.  The problem of the invention is to create a method and an apparatus having a hydraulic roller actuator for the suppression of vibrations in a rolling mill, with which in particular the third-octave vibrations can be effectively suppressed and thereby the quality of the rolled material and/or the productivity of the rolling mill can be improved.  This problem is solved by a method in which the control variable is supplied to an electro-hydraulic actuating unit and then due to this actuating unit at least one hydraulic actuator for the roller setting is actuated, wherein the electro-hydraulic actuating unit has a nominal rate of flow ≥ 50 l/min and at least a portion of the frequency response at frequencies f ≥ 80 Hz is characterized by a drop in value of ≤ 3 dB, and in this frequency range, the phase drop ϕ satisfies the conditions (I) and ϕ < 90°. The present invention relates to a method and to an apparatus for suppression of vibrations in a rolling mill.  The problem of the invention is to create a method and an apparatus having a hydraulic roller actuator for the suppression of vibrations in a rolling mill, with which in particular the third-octave vibrations can be effectively suppressed and thereby the quality of the rolled material and/or the productivity of the rolling mill can be improved.  This problem is solved by a method in which the control variable is supplied to an electro-hydraulic actuating unit and then due to this actuating unit at least one hydraulic actuator for the roller setting is actuated, wherein the electro-hydraulic actuating unit has a nominal rate of flow ≥ 50 l/min and at least a portion of the frequency response at frequencies f ≥ 80 Hz is characterized by a drop in value of ≤ 3 dB, and in this frequency range, the phase drop ϕ satisfies the conditions (I) and ϕ < 90°. A polyarylene ether ketone having an improved inherent color is obtained if one performs the reaction of an aromatic dihalogen compound with a bisphenol in a high-boiling solvent and in the presence of an auxiliary base in such a way that the dihalogen compound and solvent are heated together in the reaction vessel and at least 50 mol% of the bisphenol are metered into the reaction vessel once the internal temperature is at least 180°C.

Description

DO AND APPARATUS FOR THE ELIMINATION OF OSCILLATION A CIRCULATING INSTALLATION FIELD OF THE INVENTION This invention relates to a method and the elimination of oscillations in an ins iant.

Specifically, the invention relates to the elimination of oscillations, in pa oscillations of the 3rd-octave, in an insulator having at least one roller circulating position and having at least one assemblies, wherein at least one is provided One of the permanently circulating installations, a manipulated variable that varies with the mine in real time with the help of this regula G, material resistance and velocity of the bn lead these oscillations to considerable damage, as well as to defects in the 3rd-octave material, also calls of the 3rd-octave, are known by a persistence in the technique of the multiplicity of oscil curren in circulating processes. Ctava oscillations typically occur in a frequency range of 80 to 170 Hz and are characterized by a nest of energy and unstable oscillating states, because considerable mechanical damage also occurs in the circulating position of an instigator. Subsequently, however, these oscillate lead to movements of the guide roller assembly to differences from the interval ci to, this leads to defects in the material ci The tava depends substantially on the respective configuration and the circulating parameters and may also differ from them. In a method of limiting oscillations ("active compensation"), at least one constantly variable variable of the installation circulates in a regulator, which calculates a iada that varies with time. When activating in the deco for the roller coupling, it is the variables controlled substantially in defined ales, that is to say except, for example, excessive measures.

EP 1457274 A2 describes a method and apparatus that oscillations of the 3rd and 5th octave circulating ion. In this case, at least one roll of rollers is operated by means of a the elimination of the oscillations in a system by means of which, in particular, oscillations of the 3rd-octave are felt, while it is possible to improve the quality of the circulating material or the circulating installation.

This object is achieved by an initialization method, in which the variable manipulates in an activation element electrohydra activating element acts at least on an ai for the roller coupling, in order to activate electrohydraulic has a pr classified owl of > 50 1 / min and at least one per frequency response at frequencies f > 80 teriza by a magnitude reduction of < 3 dB, so phase 0 at this frequency level satisf , the dynamic response of valves can be characterized by the frequency response. The response is therefore convenient for the reliability of a valve for the priestes, in the sense of the dynamic response of the frequency response, it is of the phase and the response of magnitude, of nuas is known by a experienced person, for example: Chapter 3.7.2 Verhalten im Frequenz [Response in the frequency domain] by W. reprint of a servohydraulic reading, Institute for Impulses and Hydraulics and Tires and Control in R TH 1992.

For the purposes of description, a dis ° (DELAY response). Since the response depends on several operating parameters that are established for the delay of the phase of magnitude, they can be determined in a range of ± 50%, preferably 85% (0% corresponds to no operation, ie it is closed to a fully operated valve, it is completely open) and a pressure of the rated pressure of the valve. In many frequency tests it can, but does not need to be determined experimentally, since the frequency for many valves is already established from the data. The stable data sheets are of magnitude, that is, the amplification factor of the input signal and output signal, to the scale of the arithmic decibel scale ina with a pressure difference of 70 bar, fully operated valve stroke. The phase 0 delay in ° can be determined at numerical value p, in which the frequency is inserted using Hz.

The method according to the invention is carried out in a particularly advantageous manner, a portion of the frequency response of the electrohydraulic enervation is characterized in frequency 0 > f > 80 Hz by a decrease in magnitude of this frequency level, the delay of the face the conditions f = 19 - ^ + 3.1 · 10"6 · f, preferent · ¾ / < ^ + 3.1 · 10" 6 · f, particularly in prlfi + 3 form? · \ 0 ~ 6 > f | and 0 < 90 °. These modalities see possible to achieve additional improvements Coupling, a hydraulic pressure or the coupling of a hydraulic actuator with a roller pin is used as an integral variable. This fact is immediately evident eleration joins the hydraulic pressure and the activation of the actuator via the law of the principle of m is F - m - xr F is the action of force, for erza F where F = pA, in this way allows a ptible and accurate med.

Advantageously, the oscillations that occur are advantageously identified and, as a consequence, they are suppressed particularly and quickly, if a load is permanently provided in a regulating mode of < 1 ms, preferably < 0.2 ms An additional advantageous mode of ste in the difference in accelerations e of one or more bandpass filters, preferably more than the bandpass filters of second modes make it possible to filter out the components that are relevant for oscillations outside a moderate variable and to be proportional.

It is also advantageous that the detergent regulator manipulated taking into account an attic rule and an exemplary element characterizing the installation and / or the response of the installer contain a hydraulic and / or circulating force model. This regulator of agreement ensures that the circulating installation mu is desired, which is predetermined by the iad, regardless of the large number of the respective pu tion.

The value of the variable manipulation signal is at least partially, or even by way of compensation for the change of the triggered activation phase.

It is also advantageous to provide the connection in a non-linear compensation element and to reduce or compensate for the non-linearities of the hydraulic roller. A person skilled in the art knows, for example, the flow dynamics of a hydraulic valve, this dynamic of a hydraulic cylinder has significant properties. Once these non-lines nocen, 'it is possible to overcome them completely or ally by means of non-linear compensation.

In a further advantageous version of the method with the invention, the variable manipulates It involves each other, thus making possible the performance of the entire system.

The efficiency of the method according to the invention will also be improved if the pressure of the control supply and / or the pressure of the tank in the electrohydraulic eviction is stabilized by hydraulic modulators. This measure shortens the ti ti of the activation element and the activation results that respond uniformly, regardless of trans-pressure fluctuations.

In the case of high circulating circulating positions, it is advantageous for the electrohydraulic ele- ment to have a specified proportion of > 100 1 / min, preferably > 200 1 / mi it is possible to also use an activation element for the high volume that flows or e . The volume of the cylinder is obtained from the formula, in which the piston area is Vcy and e O of the hydraulic cylinder is the "cycle." For particularly large dynamics for elimination, it is advantageous to associate one and only one acic for the roller coupling with each activation.

To allow the method of agreement, which solves the problem in the tion is based, to be implemented as directly as possible, it is advantageous that a hydraulic valve richly, in which the variable manipulated istrar and at least one roller hydraulic cylinder, By means of which it is provided in the set of rollers that can activate the hydraulic valve has a reduction of We get a portion of the hydraulic frequency response at frequencies > 8 percent 200 > f > 80 Hz has a- decrease tud of < 3 dB and at this frequency level the re satisfies the conditions / > \ 9 · \ [f + 3.1 · 10"6 rentement 'Particular and de rible f > 90 °.

In a further advantageous embodiment of the invention, a measuring device for an acceleration, pressure or measuring force sensor is connected, for example, digitally via cable or fieldbus.

An advantageous measuring device can 1 n measurement device have two sensing, where a sensor is connected to the if a supply line and / or a continuous tank line in the hydraulic valve hydraulic tensioner for pressure stabilization When the circulating forces are raised, design the apparatus so that the lica has a rated flow rate d, preferably > 200 l / min.

By sale, the hydraulic actuator element has a given flow rate = 159 -Vcy, in which case, once again, the cylinder can be inserted into m3, resulting in a flow rate classified as 1 / min.

An advantageous form of the apparatus, due to particularly compact, can be achieved if the re with the hydraulic valve form an assembly.

BRIEF DESCRIPTION OF THE FIGURES The advantages and additional characteristics of the invention will be evident from the application of the exemplary and criminal modes, being made with reference to the following, in which: Figure 1 shows a schematic diagram controlled for the elimination of oscillations. Figure 2 shows a schematic circulating ion diagram that has the apparatus according to the elimination of oscillations and Figure 3 shows the level of agreement of the delay of the phase of a hydrolyzed element.

DETAILED DESCRIPTION OF THE INVENTION For the oscillations of vibration in a regulating circuit 4, it contains a model control algorithm that characterizes the model and calculates at least one variable 6 real manip O, taken into account the nominal variable variable measurement 5, that the Variable 6 manipulates the time and is provided in an element / delay and then in a component 8 of comp neal. A conduction / delay element 7 makes r the phase angle of a signal, in other words, the variable 6 manipulated. Such a phase variation is particularly advantageous because it is assumed that the specific circulating vibration frequency will be substantial, and this knowledge can be used to improve the specific oscillation elimination.

Significant conditions, for example in the hydraulic servo-valve 9 and / or the hydraulic cylinder 11, are compensated for the compensator 8. The manipulated variable signal, which has been changed and changed by phase, is provided with a valve 9. hydraulic, which is in the form of continuous valve, single phase or proportional mul or control valve. The flow is then supplied in at least one active in the form of a hydraulic cylinder 11 and forces in a roller in the roller assembly possible to extract primarily deliberately from a variable disturbance 13 and deliberately to deliberately dump the . Both measures have an advantageous effect nation of the oscillations of the 3rd octave and Roller opulation in which case not only acts as roller coupling, but also spraying. The position signals 14, the signaling and the acceleration signals 16 from a S eleration are indicated as input variables 4.

Figure 3 shows the phase delay of the invention of an electrohydraulic valve f is plotted in Hz in the measurement and delay in the abscissa. For reasons of clarity, the alarm has been turned off at 350 Hz. The delay of the following as follows: if, for example, there is interest interest for a phase delay of 60 °, it is day in which the phase response 0 = -60 °, and at 0 = 60 ° is inserted in the equation f = \ 9 ·? ß + 3? - List of reference symbol 1 acceleration sensor 2 measurement variable 3 band pass filter 4 regulator 5 nominal variable 6 manipulated variable 7 driving element / delay 8 compensator 9 hydraulic valve 10 volume flow 11 hydraulic cylinder 12 current position 13 disturbance variable 14 position signal 15 pressure signal

Claims (1)

1. NOVELTY OF THE INVENTION Having described the present invention as a novelty and therefore claiming what is described in the following: CLAIMS 1. A method for eliminating oscillations of the 3rd-octave, circulating loop having a circul position with roller coupling and having a conjugate, where at least one measure is provided of the circulating installation, a manipulated variable that varies with the ti ina in real time with the help of this regulated controlled bles are maintained substantially in ales defined by at least one activator that acts tud of = 3 dB and the phase of delay 0 in this n met satisfies the conditions 2. The method according to claim 1 is characterized in that at least a portion of the frequency of the hydraulic actuation element is characterized in the frequencies of the decrease of magnitude of = 3 dB and, in this case, the phase of delay 0 satisfies / = 23- ^ + 3.1 · 106 · f, preferably / = 27 90 °. 3. The method according to claim 2 is characterized in that at least a portion of the frequency of the hydraulic actuation element is characterized at frequencies 2. ULTIMATE for the roller coupling is permanently used. 5. The method of conformance to a preceding ndications is characterized by permanently measured measure is provided at a sampling time of < 1 ms, preferably < 6. The method according to a preceding ndications, is characterized by the accelerations between the value in the shaft and the value in the hydraulic cylinder housing for the roller coupling a permanently measured variable. 7. The method of conformance to a preceding ndication is characterized by permanently measured per se filtered by means of bandpass d ilters. The mathematical control rule and an element e characterize the state of the installation and / or the re-installation and preferably contain a hydraulic and / or mechanical and / or circulating mode. 10. The method of conformance to a preceding ndication, characterized by manipulated d is provided to an element / delay, and the phase angle of the ula varies in this case. 11. The method of conformance to a preceding ndication is characterized in that the manipulated material is provided to a non-linear element, and the non-linearities of the hydraulic roller are reduced or competed. 12. The method of compliance with a Previous designations, characterized by the supply and / or control pressure of the tank in the hydraulic actuator element is stabilized by means of accumulators. 14. The method of conformance to a preceding ndication, characterized by an electrohydraulic activation function has a rated rate of 100 1 / min, preferably,. 15. The method of conformity with a ndications 1 to 13, is characterized in that the electrohydraulic elerrt ation has a specified proportion of Qdasified = 1592-VcyJ and an element acting on one and only one activator hi the roller coupling. or is determined in real time, characterized by electrically operated hydraulic valve can be provided the manipulated variable and the hydraulic dro for the roller coupling, at least one roller in the roller assembly set, where the hydraulic valve a rated proportion has of = .50 1 / min, at least one frequency response at frequencies f = 80 H decrease in magnitude of = 3 dB and the phase of rete frequency level satisfies and 0 90 °. 17. The apparatus in accordance with the claim characterized in that at least a portion of the frequency of the hydraulic valve has a dissonance of = 3 dB at frequencies = 80 Hz and, consequently, the delay of phase 0 satisf F + 19. The apparatus in accordance with a ndications 16 to 18, is characterized by a measurement site is in the form of u, pressure or force. 20. The apparatus in accordance with a ndications 16 to 19, is characterized by a measurement device having two acceleration sensors, a sensor is connected to the piston rod and one is connected to the cylinder housing of a roller coupling device. 21. The apparatus according to a designation 19 or 20 is characterized in that an ion of an acceleration sensor is disposed in the direction of coupling of a ulica has a rated flow rate, preferably = 200 1 / min. 24, The apparatus in accordance with ndications 16 to 23, is characterized in that the ulica has a rated flow rate = 1592'Vcyj. 25. The apparatus in accordance with a ndications 16 to 24, is characterized in that the r with the hydraulic valve form an assembly is located in the immediate physical vicinity of the hydraulic. 26. The apparatus in accordance with a ndications 16 to 25, is characterized in that an ulica together with a hydraulic roller roller cylinder form an assembly, or the ulica is located in the immediate physical vicinity.